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OUR SOLAR SYSTEM

OUR SOLAR SYSTEM. 7th Grade Science Mrs. Monti & Ms. Riley. The Sun. The sun accounts for 99.8% of the solar system’s total mass. WOW! The sun is a star. The sun is made of two gases: hydrogen and helium. Features of the Sun. Sunspots – dark areas on the sun that are cooler

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OUR SOLAR SYSTEM

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  1. OUR SOLAR SYSTEM 7th Grade Science Mrs. Monti & Ms. Riley

  2. The Sun • The sun accounts for 99.8% of the solar system’s total mass. WOW! • The sun is a star. • The sun is made of two gases: hydrogen and helium

  3. Features of the Sun • Sunspots – dark areas on the sun that are cooler • Solar Flares – eruptions of gases at sun’s surface • Solar Wind – these particles can affect the Earth’s magnetic field

  4. The Inner Planets • These are small, dense planets with rocky surfaces. Often called terrestrial planets. • Mercury – craters, no atmosphere, iron core • Venus – volcanoes, sulfuric acid atmosphere • Earth – liquid water at surface & atmosphere • Mars – red planet, has seasons like Earth due to its tilt

  5. The Outer Planets • These planets are more massive with no solid surfaces. Known as gaseous planets. • Jupiter – Largest and most massive planet with Great Red Spot • Saturn – rings • Uranus – rotates from top to bottom • Neptune – cold, blue planet with clouds

  6. What about Pluto? • After watching the Youtube clip, write three reasons why Pluto was no longer considered a planet in 2006? • The orbit is very strange intersecting other planet’s. • It is not as big as first thought. • They have found other similar bodies. • Now called a dwarf planet.

  7. Comets • Comets are loose collections of ice, dust and small rocky particles whose orbits are usually very long, narrow eclipses. • Parts of a comet: • Coma = fuzzy outer layer (gas part) • Nucleus = solid inner core (ice & dust) • Tail = points away from sun; there are 2 (a gas tail and a dust tail) • Click here for Comet Animation

  8. Asteroids • These are rocky objects revolving around the sun that are two small and numerous to be considered planets. • The Asteroid Belt is between Mars and Jupiter. • They are possibly leftover pieces of the early solar system that never formed into planets.

  9. Meteors • A meteroid is a chunk of rock or dust in space that does not orbit the sun. They come from comets or asteroids. • A meteor is a meteoroid which enters the Earth’s atmosphere. • A meteorite is a meteor that hits the Earth’s surface.

  10. Hoba Meteorite • Largest recovered meteorite. • Discovered inNambia (Africa) in 1920 • Weighs over 60 tons or 60,000 kg

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